#include <stdio.h>

int main()
{
    float radius, circumference; /* declare an input and output item */

    radius = 2.0;     /* set a avlue for the radius */
    circumference = 2.0 * 3.1416 *radius;   /*calculate the circumference */
    printf("The circumference of  the circle is %f\n", circumference);

    return 0;
}